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1) Ensure you pick up all pages that mention your site but don’t link to you. - Not everyone on the internet links to external websites, and when they blog about your site or mention your site they may not link to you. That’s right, some people don’t know how to, some people don’t feel the need to, some people haven’t even thought about it and some people are just plain lazy. This means that if you can find these people that talk about (but don’t link to) your site then contact them, ask them to simply add a link to your site where they have mentioned it
2) Gain links from people trying to hot-link your images. - If you run a site of any size or any worth then you will almost certainly have plenty of images on your site which people will want to steal, borrow, pilfer or just blog about. Patrick Altoft has written a fantastic script which allows you to gain links from anyone who is looking to use your images. Go read the post here. Just try it for yourself, click the link then right click the image at the top!
3) Keep your friends close, your enemies closer. - The idea is very simple and plays on people’s ego’s. In a nutshell, the sites which already rank for your target key phrases are the holy-grail of links, but it can often be difficult to get links from them since you are by definition in competition with them (in the SERPs at least!). So how about creating a competition, or award and handing it out to the top ranking sites in your sector? Everyone loves awards and the chances are that people will then link back to the source of the awards.
4) Flamebait – like linkbait only flame grilled. - This one is slightly more left-field than the others and I wouldn’t recommend doing this unless you were sure what you’re doing and also don’t mind a bit of a word-fight! The basic premise? Find a way to get sued. Working on the any PR is good PR (and equivalently, any links are good links) Andy Beal blogs about the subject in more depth here.
Source: Link Building

